图片防盗链

自定义一个继承自httphandle的类

Code
  1using System;
  2using System.Web;
  3using System.IO;
  4
  5namespace WebTj.Jhttphandle
  6{
  7    /**//// <summary>
  8    /// Httphandles 的摘要说明。
  9    /// </summary>
 10    public class Httphandles:IHttpHandler
 11    {
 12        public Httphandles()
 13        {
 14            //
 15            // TODO: 在此处添加构造函数逻辑
 16            //
 17        }
 18        public void ProcessRequest(System.Web.HttpContext context)
 19         {
 20            FileInfo file = new System.IO.FileInfo(context.Request.PhysicalPath);
 21             if(context.Request.UrlReferrer !=null && context.Request.UrlReferrer.Host == "200.1.2.84")//判断是否是本地引用，如果是则返回给客户端正确的图片，这里的判断就是用到了前面所述的http请求中所记路的参考页信息
 22             {
 23                 context.Response.Expires = 0;//设置客户端缓冲中文件过期时间为0，即立即过期。
 24                 context.Response.Clear();//清空服务器端为此会话开辟的输出缓存
 25                 context.Response.ContentType =GetContentType(context.Request.PhysicalPath); //获得文件类型
 26                 context.Response.WriteFile(context.Request.PhysicalPath);//将请求文件写入到服务器端为此会话开辟的输出缓存中
 27                 context.Response.End();//将服务器端为此会话开辟的输出缓存中的信息传送到客户端
 28             }
 29             else //如果不是本地引用，则属于盗链引用，返回给客户端错误的图片
 30             {
 31                 context.Response.Expires = 0; //设置客户端缓冲中文件过期时间为0，即立即过期。
 32                 context.Response.Clear();//清空服务器端为此会话开辟的输出缓存
 33                 context.Response.ContentType = GetContentType("/Images/loading.gif"); //获得文件类型
 34                 context.Response.WriteFile("/Images/loading.gif");//将特殊的报告错误的图片文件写入到服务器端为此会话开辟的输出缓存中
 35                 context.Response.End();//将服务器端为此会话开辟的输出缓存中的信息传送到客户端
 36             }
 37            
 38
 39         }
 40        public bool IsReusable
 41        {
 42            get
 43            {
 44                return true;
 45            }
 46        }
 47
 48        protected static string GetContentType(string strFileName)
 49        {
 50            string strExtendName = strFileName.Substring(strFileName.LastIndexOf('.'));
 51            if (strExtendName=="")
 52            {
 53                return "";
 54            }
 55            string strRet = "";
 56            switch (strExtendName)
 57            { 
 58                case ".*": strRet = "application/octet-stream";break;
 59                case ".001": strRet = "application/x-001";break; 
 60                case ".301": strRet = "application/x-301";break; 
 61                case ".323": strRet = "text/h323" ;break;
 62                case ".906": strRet = "application/x-906" ;break;
 63                case ".907": strRet = "drawing/907" ;break;
 64                case ".a11": strRet = "application/x-a11";break; 
 65                case ".acp": strRet = "audio/x-mei-aac" ;break;
 66                case ".ai": strRet = "application/postscript" ;break;
 67                case ".aif": strRet = "audio/aiff" ;break;
 68                case ".aifc": strRet = "audio/aiff" ;break;
 69                case ".aiff": strRet = "audio/aiff" ;break;
 70                case ".anv": strRet = "application/x-anv" ;break;
 71                case ".asa": strRet = "text/asa";break; 
 72                case ".asf": strRet = "video/x-ms-asf";break; 
 73                case ".asp": strRet = "text/asp";break; 
 74                case ".asx": strRet = "video/x-ms-asf";break; 
 75                case ".au": strRet = "audio/basic";break; 
 76                case ".avi": strRet = "video/avi";break; 
 77                case ".awf": strRet = "application/vnd.adobe.workflow";break; 
 78                case ".biz": strRet = "text/xml";break; 
 79                case ".bmp": strRet = "application/x-bmp";break; 
 80                case ".bot": strRet = "application/x-bot";break; 
 81                case ".c4t": strRet = "application/x-c4t";break; 
 82                case ".c90": strRet = "application/x-c90";break; 
 83                case ".cal": strRet = "application/x-cals";break; 
 84                case ".cat": strRet = "application/vnd.ms-pki.seccat";break; 
 85                case ".cdf": strRet = "application/x-netcdf";break; 
 86                case ".cdr": strRet = "application/x-cdr";break; 
 87                case ".cel": strRet = "application/x-cel";break; 
 88                case ".cer": strRet = "application/x-x509-ca-cert";break; 
 89                case ".cg4": strRet = "application/x-g4";break; 
 90                case ".cgm": strRet = "application/x-cgm";break; 
 91                case ".cit": strRet = "application/x-cit";break; 
 92                case ".class": strRet = "java/*";break; 
 93                case ".cml": strRet = "text/xml";break; 
 94                case ".cmp": strRet = "application/x-cmp";break; 
 95                case ".cmx": strRet = "application/x-cmx";break; 
 96                case ".cot": strRet = "application/x-cot";break; 
 97                case ".crl": strRet = "application/pkix-crl";break; 
 98                case ".crt": strRet = "application/x-x509-ca-cert";break; 
 99                case ".csi": strRet = "application/x-csi";break; 
100                case ".css": strRet = "text/css";break; 
101                case ".cut": strRet = "application/x-cut";break; 
102                case ".dbf": strRet = "application/x-dbf";break; 
103                case ".dbm": strRet = "application/x-dbm";break; 
104                case ".dbx": strRet = "application/x-dbx";break; 
105                case ".dcd": strRet = "text/xml";break; 
106                case ".dcx": strRet = "application/x-dcx";break; 
107                case ".der": strRet = "application/x-x509-ca-cert";break; 
108                case ".dgn": strRet = "application/x-dgn";break; 
109                case ".dib": strRet = "application/x-dib";break; 
110                case ".dll": strRet = "application/x-msdownload";break; 
111                case ".doc": strRet = "application/msword";break; 
112                case ".dot": strRet = "application/msword";break; 
113                case ".drw": strRet = "application/x-drw";break; 
114                case ".dtd": strRet = "text/xml";break; 
115                    //case ".dwf": strRet = "Model/vnd.dwf";break; 
116                case ".dwf": strRet = "application/x-dwf";break; 
117                case ".dwg": strRet = "application/x-dwg";break; 
118                case ".dxb": strRet = "application/x-dxb";break; 
119                case ".dxf": strRet = "application/x-dxf";break; 
120                case ".edn": strRet = "application/vnd.adobe.edn";break; 
121                case ".emf": strRet = "application/x-emf";break; 
122                case ".eml": strRet = "message/rfc822";break; 
123                case ".ent": strRet = "text/xml";break; 
124                case ".epi": strRet = "application/x-epi";break; 
125                case ".eps": strRet = "application/x-ps";break; 
126                    //case ".eps": strRet = "application/postscript";break; 
127                case ".etd": strRet = "application/x-ebx";break; 
128                case ".exe": strRet = "application/x-msdownload";break; 
129                case ".fax": strRet = "image/fax";break; 
130                case ".fdf": strRet = "application/vnd.fdf";break; 
131                case ".fif": strRet = "application/fractals";break; 
132                case ".fo": strRet = "text/xml";break; 
133                case ".frm": strRet = "application/x-frm";break; 
134                case ".g4": strRet = "application/x-g4";break; 
135                case ".gbr": strRet = "application/x-gbr";break; 
136                case ".gcd": strRet = "application/x-gcd";break; 
137                case ".gif": strRet = "image/gif";break; 
138                case ".gl2": strRet = "application/x-gl2";break; 
139                case ".gp4": strRet = "application/x-gp4";break; 
140                case ".hgl": strRet = "application/x-hgl";break; 
141                case ".hmr": strRet = "application/x-hmr";break; 
142                case ".hpg": strRet = "application/x-hpgl";break; 
143                case ".hpl": strRet = "application/x-hpl";break; 
144                case ".hqx": strRet = "application/mac-binhex40";break; 
145                case ".hrf": strRet = "application/x-hrf";break; 
146                case ".hta": strRet = "application/hta";break; 
147                case ".htc": strRet = "text/x-component";break; 
148                case ".htm": strRet = "text/html";break; 
149                case ".html": strRet = "text/html";break; 
150                case ".htt": strRet = "text/webviewhtml";break; 
151                case ".htx": strRet = "text/html";break; 
152                case ".icb": strRet = "application/x-icb";break; 
153                case ".ico": strRet = "image/x-icon";break; 
154                    //case ".ico": strRet = "application/x-ico";break; 
155                case ".iff": strRet = "application/x-iff";break; 
156                case ".ig4": strRet = "application/x-g4";break; 
157                case ".igs": strRet = "application/x-igs";break; 
158                case ".iii": strRet = "application/x-iphone";break; 
159                case ".img": strRet = "application/x-img";break; 
160                case ".ins": strRet = "application/x-internet-signup";break;
161                case ".isp": strRet = "application/x-internet-signup";break; 
162                case ".IVF": strRet = "video/x-ivf";break; 
163                case ".java": strRet = "java/*";break; 
164                case ".jfif": strRet = "image/jpeg";break; 
165                case ".jpe": strRet = "image/jpeg";break; 
166                    //case ".jpe": strRet = "application/x-jpe";break; 
167                case ".jpeg": strRet = "image/jpeg";break; 
168                case ".jpg": strRet = "image/jpeg";break; 
169                    //case ".jpg": strRet = "application/x-jpg";break; 
170                case ".js": strRet = "application/x-javascript";break; 
171                case ".jsp": strRet = "text/html";break; 
172                case ".la1": strRet = "audio/x-liquid-file";break; 
173                case ".lar": strRet = "application/x-laplayer-reg";break; 
174                case ".latex": strRet = "application/x-latex";break; 
175                case ".lavs": strRet = "audio/x-liquid-secure";break; 
176                case ".lbm": strRet = "application/x-lbm";break; 
177                case ".lmsff": strRet = "audio/x-la-lms";break; 
178                case ".ls": strRet = "application/x-javascript";break; 
179                case ".ltr": strRet = "application/x-ltr";break; 
180                case ".m1v": strRet = "video/x-mpeg";break; 
181                case ".m2v": strRet = "video/x-mpeg";break; 
182                case ".m3u": strRet = "audio/mpegurl";break; 
183                case ".m4e": strRet = "video/mpeg4";break; 
184                case ".mac": strRet = "application/x-mac";break; 
185                case ".man": strRet = "application/x-troff-man";break; 
186                case ".math": strRet = "text/xml";break; 
187                case ".mdb": strRet = "application/msaccess";break; 
188                    //case ".mdb": strRet = "application/x-mdb";break; 
189                case ".mfp": strRet = "application/x-shockwave-flash";break; 
190                case ".mht": strRet = "message/rfc822";break; 
191                case ".mhtml": strRet = "message/rfc822";break; 
192                case ".mi": strRet = "application/x-mi";break; 
193                case ".mid": strRet = "audio/mid";break; 
194                case ".midi": strRet = "audio/mid";break; 
195                case ".mil": strRet = "application/x-mil";break; 
196                case ".mml": strRet = "text/xml";break; 
197                case ".mnd": strRet = "audio/x-musicnet-download";break; 
198                case ".mns": strRet = "audio/x-musicnet-stream";break; 
199                case ".mocha": strRet = "application/x-javascript";break; 
200                case ".movie": strRet = "video/x-sgi-movie";break; 
201                case ".mp1": strRet = "audio/mp1";break; 
202                case ".mp2": strRet = "audio/mp2";break; 
203                case ".mp2v": strRet = "video/mpeg";break; 
204                case ".mp3": strRet = "audio/mp3";break; 
205                case ".mp4": strRet = "video/mpeg4";break; 
206                case ".mpa": strRet = "video/x-mpg";break; 
207                case ".mpd": strRet = "application/vnd.ms-project";break; 
208                case ".mpe": strRet = "video/x-mpeg";break; 
209                case ".mpeg": strRet = "video/mpg";break; 
210                case ".mpg": strRet = "video/mpg";break; 
211                case ".mpga": strRet = "audio/rn-mpeg";break; 
212                case ".mpp": strRet = "application/vnd.ms-project";break; 
213                case ".mps": strRet = "video/x-mpeg";break; 
214                case ".mpt": strRet = "application/vnd.ms-project";break; 
215                case ".mpv": strRet = "video/mpg";break; 
216                case ".mpv2": strRet = "video/mpeg";break; 
217                case ".mpw": strRet = "application/vnd.ms-project";break; 
218                case ".mpx": strRet = "application/vnd.ms-project";break; 
219                case ".mtx": strRet = "text/xml";break; 
220                case ".mxp": strRet = "application/x-mmxp";break; 
221                case ".net": strRet = "image/pnetvue";break; 
222                case ".nrf": strRet = "application/x-nrf";break; 
223                case ".nws": strRet = "message/rfc822";break; 
224                case ".odc": strRet = "text/x-ms-odc";break; 
225                case ".out": strRet = "application/x-out";break; 
226                case ".p10": strRet = "application/pkcs10";break; 
227                case ".p12": strRet = "application/x-pkcs12";break; 
228                case ".p7b": strRet = "application/x-pkcs7-certificates";break; 
229                case ".p7c": strRet = "application/pkcs7-mime";break; 
230                case ".p7m": strRet = "application/pkcs7-mime";break; 
231                case ".p7r": strRet = "application/x-pkcs7-certreqresp";break; 
232                case ".p7s": strRet = "application/pkcs7-signature";break; 
233                case ".pc5": strRet = "application/x-pc5";break; 
234                case ".pci": strRet = "application/x-pci";break; 
235                case ".pcl": strRet = "application/x-pcl";break; 
236                case ".pcx": strRet = "application/x-pcx";break; 
237                case ".pdf": strRet = "application/pdf";break;                 
238                case ".pdx": strRet = "application/vnd.adobe.pdx";break; 
239                case ".pfx": strRet = "application/x-pkcs12";break; 
240                case ".pgl": strRet = "application/x-pgl";break; 
241                case ".pic": strRet = "application/x-pic";break; 
242                case ".pko": strRet = "application/vnd.ms-pki.pko";break; 
243                case ".pl": strRet = "application/x-perl";break; 
244                case ".plg": strRet = "text/html";break; 
245                case ".pls": strRet = "audio/scpls";break; 
246                case ".plt": strRet = "application/x-plt";break; 
247                case ".png": strRet = "image/png";break;                 
248                case ".pot": strRet = "application/vnd.ms-powerpoint";break; 
249                case ".ppa": strRet = "application/vnd.ms-powerpoint";break; 
250                case ".ppm": strRet = "application/x-ppm";break; 
251                case ".pps": strRet = "application/vnd.ms-powerpoint";break; 
252                case ".ppt": strRet = "application/vnd.ms-powerpoint";break;                 
253                case ".pr": strRet = "application/x-pr";break; 
254                case ".prf": strRet = "application/pics-rules";break; 
255                case ".prn": strRet = "application/x-prn";break; 
256                case ".prt": strRet = "application/x-prt";break; 
257                case ".ps": strRet = "application/x-ps";break;                 
258                case ".ptn": strRet = "application/x-ptn";break; 
259                case ".pwz": strRet = "application/vnd.ms-powerpoint";break; 
260                case ".r3t": strRet = "text/vnd.rn-realtext3d";break; 
261                case ".ra": strRet = "audio/vnd.rn-realaudio";break; 
262                case ".ram": strRet = "audio/x-pn-realaudio";break; 
263                case ".ras": strRet = "application/x-ras";break; 
264                case ".rat": strRet = "application/rat-file";break; 
265                case ".rdf": strRet = "text/xml";break; 
266                case ".rec": strRet = "application/vnd.rn-recording";break; 
267                case ".red": strRet = "application/x-red";break; 
268                case ".rgb": strRet = "application/x-rgb";break; 
269                case ".rjs": strRet = "application/vnd.rn-realsystem-rjs";break; 
270                case ".rjt": strRet = "application/vnd.rn-realsystem-rjt";break; 
271                case ".rlc": strRet = "application/x-rlc";break; 
272                case ".rle": strRet = "application/x-rle";break; 
273                case ".rm": strRet = "application/vnd.rn-realmedia";break; 
274                case ".rmf": strRet = "application/vnd.adobe.rmf";break; 
275                case ".rmi": strRet = "audio/mid";break; 
276                case ".rmj": strRet = "application/vnd.rn-realsystem-rmj";break; 
277                case ".rmm": strRet = "audio/x-pn-realaudio";break; 
278                case ".rmp": strRet = "application/vnd.rn-rn_music_package";break; 
279                case ".rms": strRet = "application/vnd.rn-realmedia-secure";break; 
280                case ".rmvb": strRet = "application/vnd.rn-realmedia-vbr";break; 
281                case ".rmx": strRet = "application/vnd.rn-realsystem-rmx";break; 
282                case ".rnx": strRet = "application/vnd.rn-realplayer";break; 
283                case ".rp": strRet = "image/vnd.rn-realpix";break; 
284                case ".rpm": strRet = "audio/x-pn-realaudio-plugin";break; 
285                case ".rsml": strRet = "application/vnd.rn-rsml";break; 
286                case ".rt": strRet = "text/vnd.rn-realtext";break;                 
287                case ".rtf": strRet = "application/x-rtf";break; 
288                case ".rv": strRet = "video/vnd.rn-realvideo";break; 
289                case ".sam": strRet = "application/x-sam";break; 
290                case ".sat": strRet = "application/x-sat";break; 
291                case ".sdp": strRet = "application/sdp";break; 
292                case ".sdw": strRet = "application/x-sdw";break; 
293                case ".sit": strRet = "application/x-stuffit";break; 
294                case ".slb": strRet = "application/x-slb";break; 
295                case ".sld": strRet = "application/x-sld";break; 
296                case ".slk": strRet = "drawing/x-slk";break; 
297                case ".smi": strRet = "application/smil";break; 
298                case ".smil": strRet = "application/smil";break; 
299                case ".smk": strRet = "application/x-smk";break; 
300                case ".snd": strRet = "audio/basic";break; 
301                case ".sol": strRet = "text/plain";break; 
302                case ".sor": strRet = "text/plain";break; 
303                case ".spc": strRet = "application/x-pkcs7-certificates";break; 
304                case ".spl": strRet = "application/futuresplash";break; 
305                case ".spp": strRet = "text/xml";break; 
306                case ".ssm": strRet = "application/streamingmedia";break; 
307                case ".sst": strRet = "application/vnd.ms-pki.certstore";break; 
308                case ".stl": strRet = "application/vnd.ms-pki.stl";break; 
309                case ".stm": strRet = "text/html";break; 
310                case ".sty": strRet = "application/x-sty";break; 
311                case ".svg": strRet = "text/xml";break; 
312                case ".swf": strRet = "application/x-shockwave-flash";break; 
313                case ".tdf": strRet = "application/x-tdf";break; 
314                case ".tg4": strRet = "application/x-tg4";break; 
315                case ".tga": strRet = "application/x-tga";break; 
316                case ".tif": strRet = "image/tiff";break;                 
317                case ".tiff": strRet = "image/tiff";break; 
318                case ".tld": strRet = "text/xml";break; 
319                case ".top": strRet = "drawing/x-top";break; 
320                case ".torrent": strRet = "application/x-bittorrent";break; 
321                case ".tsd": strRet = "text/xml";break; 
322                case ".txt": strRet = "text/plain";break; 
323                case ".uin": strRet = "application/x-icq";break; 
324                case ".uls": strRet = "text/iuls";break; 
325                case ".vcf": strRet = "text/x-vcard";break; 
326                case ".vda": strRet = "application/x-vda";break; 
327                case ".vdx": strRet = "application/vnd.visio";break; 
328                case ".vml": strRet = "text/xml";break; 
329                case ".vpg": strRet = "application/x-vpeg005";break; 
330                case ".vsd": strRet = "application/vnd.visio";break;                 
331                case ".vss": strRet = "application/vnd.visio";break; 
332                case ".vst": strRet = "application/vnd.visio";break;
333                case ".vsw": strRet = "application/vnd.visio";break; 
334                case ".vsx": strRet = "application/vnd.visio";break; 
335                case ".vtx": strRet = "application/vnd.visio";break; 
336                case ".vxml": strRet = "text/xml";break; 
337                case ".wav": strRet = "audio/wav";break; 
338                case ".wax": strRet = "audio/x-ms-wax";break; 
339                case ".wb1": strRet = "application/x-wb1";break; 
340                case ".wb2": strRet = "application/x-wb2";break; 
341                case ".wb3": strRet = "application/x-wb3";break; 
342                case ".wbmp": strRet = "image/vnd.wap.wbmp";break; 
343                case ".wiz": strRet = "application/msword";break; 
344                case ".wk3": strRet = "application/x-wk3";break; 
345                case ".wk4": strRet = "application/x-wk4";break; 
346                case ".wkq": strRet = "application/x-wkq";break; 
347                case ".wks": strRet = "application/x-wks";break; 
348                case ".wm": strRet = "video/x-ms-wm";break; 
349                case ".wma": strRet = "audio/x-ms-wma";break; 
350                case ".wmd": strRet = "application/x-ms-wmd";break; 
351                case ".wmf": strRet = "application/x-wmf";break; 
352                case ".wml": strRet = "text/vnd.wap.wml";break; 
353                case ".wmv": strRet = "video/x-ms-wmv";break; 
354                case ".wmx": strRet = "video/x-ms-wmx";break; 
355                case ".wmz": strRet = "application/x-ms-wmz";break; 
356                case ".wp6": strRet = "application/x-wp6";break; 
357                case ".wpd": strRet = "application/x-wpd";break; 
358                case ".wpg": strRet = "application/x-wpg";break; 
359                case ".wpl": strRet = "application/vnd.ms-wpl";break; 
360                case ".wq1": strRet = "application/x-wq1";break; 
361                case ".wr1": strRet = "application/x-wr1";break; 
362                case ".wri": strRet = "application/x-wri";break; 
363                case ".wrk": strRet = "application/x-wrk";break; 
364                case ".ws": strRet = "application/x-ws";break; 
365                case ".ws2": strRet = "application/x-ws";break; 
366                case ".wsc": strRet = "text/scriptlet";break; 
367                case ".wsdl": strRet = "text/xml";break; 
368                case ".wvx": strRet = "video/x-ms-wvx";break; 
369                case ".xdp": strRet = "application/vnd.adobe.xdp";break; 
370                case ".xdr": strRet = "text/xml";break; 
371                case ".xfd": strRet = "application/vnd.adobe.xfd";break; 
372                case ".xfdf": strRet = "application/vnd.adobe.xfdf";break; 
373                case ".xhtml": strRet = "text/html";break; 
374                case ".xls": strRet = "application/vnd.ms-excel";break;                 
375                case ".xlw": strRet = "application/x-xlw";break; 
376                case ".xml": strRet = "text/xml";break; 
377                case ".xpl": strRet = "audio/scpls";break; 
378                case ".xq": strRet = "text/xml";break; 
379                case ".xql": strRet = "text/xml";break; 
380                case ".xquery": strRet = "text/xml";break; 
381                case ".xsd": strRet = "text/xml";break; 
382                case ".xsl": strRet = "text/xml";break; 
383                case ".xslt": strRet = "text/xml";break; 
384                case ".xwd": strRet = "application/x-xwd";break; 
385                case ".x_b": strRet = "application/x-x_b";break;
386                case ".x_t": strRet = "application/x-x_t"; break;
387            }
388            return strRet;
389        }
390
391
392    }
393}

接着把这个项目引入  ，在wenconfig里添加
<httpHandlers>
 <add verb="*" path="*.jpg,*.gif" type="WebTj.Jhttphandle.Httphandles,Jhttphandle"/>
</httpHandlers>
在iis中 isapi 中添加gif，jpg的映射 c:\windows\microsoft.net\framework\v1.1.4322\aspnet_isapi.dll